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Cross-sectional data showing that the amount of effort spent on personal health care increases with
Meta-analysis of 18 studies shows that aerobic exercise causes better performance in older adults on
Timing of teratogens. Vulnerability to teratogens is greatest in the embryonic period. Source: Moore
Shortly after his death, George Washington had already become myth—part Moses, part angel—in this wo
This 1900 photograph of steel factories at night in Duquesne, near Pittsburgh, was tinted by hand. S
Mixed dishes such as hamburgers and pizza are a major source of solid fats in the diets of Americans